ZODB.Transaction Management.Transaction.begin

Documentation
Start a new transaction. If a transaction is already active, it is automatically aborted. An optional string argument may be provided to supply transaction meta data. If given, this is a string consisting of the user and description separated by a tab character.
Parameters
TypeNameDefaultDocumentation
PyStringinfo'' 
Booleansubtransaction0A flag indicating whether the transaction begun should be a sub-transaction. This is most meaningful if other subtransactions have been committed in this transaction. The actuall disposition of this transaction will be determined by the call to commit or abort.